Anchorage for concrete structures.



PATBNTED JULY 31, i906.

J. A. BROWN. ANCHORAGE FOR CONCRETE STRUCTURES.

APPLICATION FILED JAN. 16, 1905.

. posed so t UNITED sTATns PATNT orinon JAMES A. BROWN, OF PHILADELPHIA, PENNSYLVANIA.

` ANCHORAGE 'Fon 'concat-:TE STRUCTURES.

Patented July 31, 1906.

Application filed January 16, 1905. Serial No. 241.284.

whereby shaft-hangers, brackets, pedestals,1

or other devices may be readily and securely attached to that port-ion of a building of which the concrete structure' forms part.

This object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 1 is a perspective view representing part of a concrete beam or girder having an anchoring device combined therewith in accordance with my invention. Fig. 2- is a transverse section of the same. Figs. 3, 4, and 5 are views illustrating different forms of stirrup forming part of my invention and intended for use in connection with the anchoring device which I have devised, and Figs. 6, 7, 8, and 9 are transverse sections of modified forms -of said anchoring device.

In Fig. l of the drawings l represents part of a concrete beam or girder, or it may form part of a concrete ceiling, wall, floor, or other structure to which machinery has torbe attached. In said concrete structure are embedded ak air of channel-bars 2 yand 3, disat their fianges face each other, thereb forming a tunnel slotted centrally throng out its extent both at top and bottom. In order to securely attach this structure to the mass of concrete, stirrups are disposed at intervals throughout the length of the same, these stirrups engaging Ithe bars 2 and 3 and having portions projecting into the mass of concrete beyond the same. As shown in Fig. 1, each stirrup consists of a bar 4, bridving the slot between the upRer flanges of the c anual-bars, the central portlon of this bar being bent upwardly into the sl t, so as to form a seat for a-yoke v5, the opposite legs of.

which project upwardly into the mass of concrete constituting the girder 1. The anchor- Ving device thus constructed and secured to the concrete structure presents at the face of the latter, whether it is be a ceiling, wall, iioor, or other part of a building, a longitudinal slot with an enlarged chamber behind the same, so that the elongated head of a bolt 6 can be passed through the slot and then turned to a position transverse thereto, so as to bear upon the lower ianges of the channelbars, to -which it is therefore confined by any outward strain exerted in the direction ofthe axis ofthe bolt.

Instead of using a stirrup composed of a cross-bar and independent yoke, as shown in Fig. 1,11-1 may employ a cross-bar such 'as shown at 4a in Fig. 3, said bar being of any desired length and being cut so as to form fingers 5a, which can be bent up from the bar, as shown, so as to serve the same pur ose-as the upwardly-extending legs of the yo e 5, or instead of extendin the legs of the stirrup through the upper lgot in the anchoring device slots may be formed in the Webs of the channel-bars, as shown, for instance, at7 in Fig. 4, and fingers 5b, projecting from the opposite sides of a bar or plate 4", may be passed through these slots 7 and bent up outside of the same, or slots or perforations may be,`

formed in the flanges of the bars for the reception of the upturned :fingers 5b or for the reception of the legs of yokes 5, as shown in Fig. 6.

I prefer' for convenience and economy to form the anchoring structure of a pair of channel-barsvdisposed so that their flanges face one another; but a slotted tube may, if desired, be used in lace of said channel-bars, such tube having, y preference, a rectangular 'cross-section, as shown in Fig. 7. In such case the legs ofthe stirrup-yoke 5 may be passed through perforations in the back of the tube, as shown in Fig. 7, or a reverse construction may be adopted-that is to say the tube may have its slot at the rear an may be combined vwith a stirrup ofthe character shown in Fig. 3 or Fig. 1, and the anchoring-bolt ma be passed through a perforation in the cibsed front vof the tube as shown, for instance, in Fig. 8, this construc' tion having the advantage over a bolt embedded directly in the concrete that it distributes the strain upon the bolt throughout a large area. It is preferable, however, to pass the anchor-bolt through a slot in the anchoring device, as such construction permits of adjustment of the bolt longitudinally on the anchoring device to any desired position. When a tube is employed in place of a pair of channel-bars, the slot may be at one side of the tube, if desired, as shown in Fig. 9, the

anchoring-bolt in this case having a projecting head on one side only, and,if desired,

IIO

stirrups may be struck up directly from the back of the tube, as shown, for instance, at in Fig. 9.

Havinor thus described my invention, I

claim and desire to secure by Letters Patent- 1 The combination .of a concrete structure with an anchoring device embedded v therein and consisting of a channel-bar structure with flanged and slotted front portion for engaging va headed bolt, and stirrups engaging the rear portion of said structure and presenting diverging fingers which project into the concrete, substantially as speciiied.

2. The combination of a concrete structure with an anchoring device embedded therein and consisting of a pair of channelbars disposed with their anges facing each other but separated so as to provide slots between said anges, and stirrups engaging with the inner ilanges, and havinglportlons -projecting through the slot between said angesand into the mass of concrete beyond the same, substantially as specified'.

3. vThe combination of a concretestructure with an .anchoring device embedded therein and having stirrups each consisting of a bar or plate having a bearing upon saidanchoring structure and provided with integral fingers bent up therefrom so as to project into the mass of concrete beyond the anchorino' device, substantially as specified.

4. The combination of a mass of concrete with an anchoring device embedded therein and consisting of a pair of channel-bars disl posed with their anges facing each other y two subscribing witnesses;

JAMES A; BROWN.

WALTER CHISM, Jos. H. KLEIN. 

